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JavaScript WeakMap
tryjs_weakmap_visitors
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<!DOCTYPE html> <html> <body> <h1>JavaScript WeakSet</h1> <p id="demo"></p> <script> let text = ""; // Create a WeakMap to store visit counts const visitsCount = new WeakMap(); // Create Visitor Objects const John = {name:"John", age:40}; const Paul = {name:"Paul", age:41}; const Ringo = {name:"Ringo", age:42}; const George = {name:"George", age:43}; // Track visits track(Paul); track(Ringo); track(Paul); track(Paul); track(John); // Function to track visitors function track(visitor) { let count = visitsCount.get(visitor) || 0; count++; visitsCount.set(visitor, count); text += visitor.name + ", age " + visitor.age + ", has visited " + count + " time(s).<br>"; } document.getElementById("demo").innerHTML = text; </script> </body> </html>